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media: ov5647: Add support for non-continuous clock mode

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The driver was only supporting continuous clock mode
although this was not stated anywhere.
Non-continuous clock saves a small amount of power and
on some SoCs is easier to interface with.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
This commit is contained in:
Dave Stevenson
2018-10-31 14:56:47 +00:00
committed by popcornmix
parent fcc0c73247
commit 8aa1abe181
1 changed files with 14 additions and 3 deletions
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17
drivers/media/i2c/ov5647.c
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@@ -44,6 +44,7 @@
#define PWDN_ACTIVE_DELAY_MS 20
#define MIPI_CTRL00_CLOCK_LANE_GATE BIT(5)
#define MIPI_CTRL00_LINE_SYNC_ENABLE BIT(4)
#define MIPI_CTRL00_BUS_IDLE BIT(2)
#define MIPI_CTRL00_CLOCK_LANE_DISABLE BIT(0)
@@ -95,6 +96,7 @@ struct ov5647 {
int power_count;
struct clk *xclk;
struct gpio_desc *pwdn;
unsigned int flags;
};
static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
@@ -269,9 +271,15 @@ static int ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
static int ov5647_stream_on(struct v4l2_subdev *sd)
{
struct ov5647 *ov5647 = to_state(sd);
u8 val = MIPI_CTRL00_BUS_IDLE;
int ret;
ret = ov5647_write(sd, OV5647_REG_MIPI_CTRL00, MIPI_CTRL00_BUS_IDLE);
if (ov5647->flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK)
val |= MIPI_CTRL00_CLOCK_LANE_GATE |
MIPI_CTRL00_LINE_SYNC_ENABLE;
ret = ov5647_write(sd, OV5647_REG_MIPI_CTRL00, val);
if (ret < 0)
return ret;
@@ -568,7 +576,7 @@ static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
.open = ov5647_open,
};
static int ov5647_parse_dt(struct device_node *np)
static int ov5647_parse_dt(struct device_node *np, struct ov5647 *sensor)
{
struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
struct device_node *ep;
@@ -581,6 +589,9 @@ static int ov5647_parse_dt(struct device_node *np)
ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &bus_cfg);
if (!ret)
sensor->flags = bus_cfg.bus.mipi_csi2.flags;
of_node_put(ep);
return ret;
}
@@ -599,7 +610,7 @@ static int ov5647_probe(struct i2c_client *client)
return -ENOMEM;
if (IS_ENABLED(CONFIG_OF) && np) {
ret = ov5647_parse_dt(np);
ret = ov5647_parse_dt(np, sensor);
if (ret) {
dev_err(dev, "DT parsing error: %d\n", ret);
return ret;